Jig



May 28, 194

JIG

Filed Sept. 25, 1944 INVENTOR; 5 BYRON M. BnreD,

B. M BIRD 2,401,218

flaw/m Patented May 28, 1946 JIG Byron v M; Bird, Columbus, Ohio, a'ssignoryby mesne assignments, to The Jeffrey ManufacturingrCompany, a corporation of. Ohio A plication. September 25, 1944, ,Serial No. 555,738

1' Claiml This invention relates to a jig, and anDbJ of the invention is to provide animproved jig and particularly to provide means to increase the mobil y of the bed adjacent the overflow lip.

Other objects of the invention will appear hereinafter, the novel features and combinations being set forth in the appended claim.

The single feature of the drawing constitutes a sectional elevational view of the jig of my invention.

It has been found desirable in a jig used either for washing coal or for the treating of other material such as iron ore to provide an eXcess of water adjacent the overflow lip where the coal or in the case of iron ore the gangue and in either case the light gravity material overflows with the water in operation. The purpose of supplying this increase in water is to increase the mobility of the bed at the discharge point, there being considerable friction owing to the horizontal force exerted by the water flowing through the jig which it is desirable to overcome. To provide this desirable characteristic I have provided a very simple but expedient modification of a standard jig.

The jig illustrated is in its principal features a standard design and may follow that disclosed in my Patent No. 2,132,376, dated October 11, 1938. Unless a contrary fact is indicated, it is to be understood that the structure of the jig of the instant application follows that of my patent above identified.

Briefly described, the jig includes a main tank or compartment H] which is generally of U- shaped construction and is provided with a perforated plate or screen II in one leg which supports the bed of materials such as a bed of coal to be cleaned or a bed of iron ore to be treated which is fed to the plate II by way of a chute I2. The jig illustrated is of the Baum type and the compartment I is divided into two parts by a transverse partition is. Water is delivered to the compartment I!) by means of a feed pipe I fv controlled by a valve IS. A hutch material screw l6 delivers hutch material to the bottom of a refuse or high gravity material boot I! in which there is a bucket elevator for removing said refuse or high gravity material. As is well known in the jigging art, the water in the compartment ID will be forced upwardly periodically through the perforated plate or screen II and thus stratify the bed of material such as coal or iron ore which is supported on the plate II and which moves downwardly thereacross due to the sloping character of the plate and the pulsating action of the liquid. The top layerof low gravity material such as clean coal Orin the case of iron ore the gangue w'ill'fiow over the lip IS with a certain amount of water anddown a chute 20 to asucceeding treatment if the jig has more than one compartment, otherwise the discharge over the chute 20 will be the finally cleaned product in the case of coal or the gangue in the case of iron ore. Below the lip l9 and adjacent the bottom edge of the sloping plate or screen II is a refuse or concentrate discharge opening 2| which leads to a refuse or concentrate chute 22. The discharge of the refuse or concentrate in chute 22 is controlled by a discharge paddle or star wheel 23 under the control of float operated discharge mechanism including a float 24. Said discharge mechanism is well known in the jigging art and wil1 not be specifically described.

In general, the structure above described is all known in the art. Novelty is introduced in the jig, however, by the provision of a water feed pipe 25 preferably provided with a control valve 26 which introduces water into the refuse boot I! entirely independent of the introduction of water into the main tank It]. The water introduced into the refuse boot l1 flows through the refuse or concentrate chute 22 either through the clearance provided adjacent the discharge or star wheel 23 or, if desired, a wall of the chute 22 may be provided with perforations 21. I have found in some instances the perforations 27 are not necessary while in others they are desirable. The water thus introduced in refuse boot I! will flow through the discharge opening 2| and up over the lip l9 thus producing an excess of water adjacent the vertical plate leading to the lip I9 or, in other words, adjacent the said overflow lip I 9. This, of course, increases the mobility of the bed at this point which I have found produces superior results.

In the operation of the jig, the untreated material will be fed to the chute l2 and form a bed on the plate or screen II where it is subjected to the pulsating action of the water passing through the screen II. This will stratify the bed into high gravity material in the bottom stratum and low gravity material in the top stratum. In the case of coal the refuse will be on the bottom with the clean coal on top. In the case of iron ore the value of iron ore concentrate will be on the bottom with the gangue on top. The float mechanism 24 will control thedischarge or star Wheel 23 to maintain an approximately uniform depth of the high gravity strata. Low gravity material and water will flow over the lip l9 and down the cent the discharge opening 2| and lip l9, thereby. producing a cleaner separation than would otherwise be effected.

Obviously those skilled in the art may make various changes in the details and arrangement I of parts without departing from the spirit and scope of the invention as defined by the claim hereto appended and I wish therefore not to be restricted to the precise construction herein disclosed.

Having thus described and shown an embodiment of my invention, what I desire to secure by Letters Patent of the United States is:

In a jig, the combination with a jigging compartment having a lip over which light material and water flow, a support for the material bed undergoing cleaning, a high gravity material boot adjacent said support, a, high gravity material conveying chute extending from said jigging compartment into said high gravity material boot having a perforate wall and adapted to convey high gravity material thereinto, a float actuated intermittently operative high gravity discharge control device including a. star wheel in said chute for controlling the level of high gravity material which accumulates in the bed, means causing pulsations of the material bed; and means introducing a substantially constant flow of water into said high gravity material boot whereby a portion of the water introduced into said boot flows by said star wheel into said chute and a portion of said water flows into said chute through the perforations in said wall thereof, all of said water flowing through said chute being discharged into the material bed for activating it throughout an area adjacent the mouth of said chute and lip.

BYRON M. BIRD. 

